Fuse



March 4 1924.

E. L. OGLE FUSE Filed Aug. 31 1921 Patented Mar. 4, 1924.

UNITED STATES.

PATENT OFFICE.

ELMEB L. OGLE, OF CHICAGO, ILLINOIS, ASSIGNOR TO FEDERAL ELECTRIC COMPANY,

' OFCHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FUSE.

Application filed August 31, 1921. Serial N0. 497,178.

To all whom it may concern Be it known that I, ELMER L. OGLE, a citizen of the United States, and a resident of Chicago, county of Cook, and State of Illi- 6 nois, have invented certain new and useful Improvements in Fuses; and I do hereby declare that the following is a full, clear, and exact description thereof, reference be ing had to the accompanying drawings, and

l to the letters of reference marked thereon,

which form a part of this specification.

This invention relates to overload circuit breakers, commonly known as fuses, and consists of the matters hereinafter described 1 and more particularly pointed out in the appended claims.

This invention relates to a novel and im proved fuse for use in multiphase circuits, which is adapted, upon an overload, and re- 20 sulting opening of the circuit of one phase,

to open the circuit of the other phase or phases.

The improved fuse is generally of the kind described and illustrated in an application 2 for patent, executed by the applicant of even date herewith (filed August 29, 1921, Ser. No. 496,207), but is designed primarily for use in a back connected installation and is provided with certain novel and improved 80 features adapted to that end.

The advantages of the invention will appear as I proceed with my specification.

In the drawings:

Figure 1 is a diagrammatic view, show- 86 ing my improved fuse as applied and connected in a three-phase system.

Figure 2 represents an enlarged side ele vation of the fuse, with part of the fuse body broken away near one end to show the cartridge.

Figure 3 is a fragmental longitudinal section through the fuse, greatly exaggerated.

Figure 4 is a section through Figure 3 in a plane indicated by the line 44 of Fig. 3.

45 Figure 5 is a perspective View of a contact blade to be later fully described.

Figure 6 is a fragmental section in a plane like that of Figure 3 showing a slight modification.

50 Referring now to that embodiment of the invention illustrated in the drawin 10 indicates the improved fuse, which 1s of the knife blade type. Three such fuses 10, 10 and 10 are shown in the diagrammatic view I of Figure 1, each connected in one of the mains 11, 11, 11 of a three-phase system, which are connected to a motor or other translating device indicated at 12. Each fuse contains a heating coil connected in multiple (in shunt as illustrated) by conductors 13, 1313, 13 -13 13 to another circuit: the conductors 13, connecting the heating coil of the fuse block 10 to the main 11*; the conductors 13, connecting the heating coil of the fuse block 10 to the main 11 and the conductors 13 connecting the heating coil of the fuse block 10 to the main 11. This is familiar practice with fuse blocks of the kind. The conductors 13, 13 and 13 are in this case located back of the board and connect the terminals of the several circuits to bolts or screws which extend through the board,-their slotted heads being located on the face of the board.

The fuse itself comprises a fibre body 14 with metallic heads 15, 16, each carrying a blade contact 15, 16, and an enclosed cartridge 17 containing fusible bars, the tell tale tags of which are indicated at 18, and a heating coil with terminals (not shown) connected to two spring contacts on the outside of the cartridge body, one of which contacts is shown exposed at 19. The construction of the fuse in these particulars is fully disclosed in the application above referred to and as the details of said construction form no part of the presentjnvention they need not be more particularly described here.

For each of two spring contacts connected with the heating coil in the cartridge of the fuse, is provided on the outer body 14 of the fuse 10 a blade contact adapted to engage in the head of a bolt or screw, which extends through the board and is connected to the terminal of a conductor of another circuit at the back of the board. 20, 20 indicates these blade contacts. Each contact 20 consists of a fiat, substantially oblong, rectangular body or blade 21 and of a short stud 22 placed symmetrically at one of the ends of the body. The blade 21 is split as indicated at 23 so that it may be capable of yielding compression when inserted in the slotted head of the bolt or screw 24 to which it is to be connected.

The contact 20 is attached to the body 14 of the fuse as follows. 25 indicates a tubular rivet inserted through a suitable opening in the fibre body of the fuse, in position so that its head will engage the associated spring contact 19 of the cartridge heating coil. The outer end of the rivet is turned down against the outer surface of the fuse body, thus securing the rivet in place. The stud 22 of the contact 20 is then fixed in the hole through the rivet, with its end flush with the head of the rivet. Thus when the cartridge is inserted into the fuse body the spring contacts 19 will engage with the heads of the rivets and with the ends of the studs 22, thus providing electrical connection between the blades 20 and the heating coil of the cartridge.

The stud 22 of the contact 20, as shown in Figure 8, is soldered in the hole through the rivet. The rivet, however, may be tapped vand the stud threaded to engage within the rivet as shown at 22 in Figure 6.

The advantages and ready and quick ap: plication of fuses of the kind described will be manifest to those familiar with the art. The single movement by means of which the fuse is applied to bring the blade contacts 15 16 into engagement with their jaw contacts, brings the blade contacts 20 of the heating coil into engagement with the bolts 2a, which extend through the board and are connected at the back of the board, as heretofore described, to another circuit.

I claim as my invention:

1. In an electric fuse for use in multiphase circuits, in combination with a fuse body and a removable cartridge containing a fusible element and a heating coil associated therewith, said cartridge havlng auxlllary contacts on the outside of its body connected to said heating coil, primary contacts 011 the outside of the fuse body, each primary c011- tact consisting of a blade split at one end and provided with a stud at the other end, said stud taking through an opening in said body and being adapted for engagement with one of said auxiliary contacts.

2. In an electric fuse for use in multihase circuits, in combination with a fuse body and a removable cartridge containing a fusible element and a heating coil associated therewith, said cartridge having auxiliary contacts on the outside of its body connected to said heating coil, primary contacts on the outside of the fuse body, each primary contact consisting of a blade having a stud at one end, the fuse body being provided with a hole, a tubular rivet inserted through said hole with its head against one side of the wall of said body and its other end riveted against the opposite side of said wall, and means securing said stud in the eye of said rivet with its end flush with the inner end of said rivet, so that it may engage an associated auxiliary contact.

3. In an electric fuse for use in multihase circuits, in combination with a fuse iiody and a removable cartridge containing a fusible element and a heating coil associated therewith, said cartridge having auxiliary contacts on the outside of its body connected to said heating coil, primary contacts on the outside of the fuse body, each primary contact consisting of a blade havlng a stud at one end, the fuse body being provided with a hole, a tubular rivet in serted through said hole with its head against one side of the wall of said body and its other end riveted against the opposite side of said wall, said stud being threaded and said rivet being tapped to receive said stud which is screwed into said rivet to bring its end flush with the inner end of said rivet in position to engage one of said auxiliary contacts.

In testimony that I claim the foregoing as my invention, I affix my signature in the presence of two witnesses, this 15th day of August, A. D. 1921.

ELMER L. OGLE.

Witnesses:

CLARENCE E. MEHLHOPE, T. H. ALFREDB. 

